2855521 has 4 divisors (see below), whose sum is σ = 2863044. Its totient is φ = 2848000.

The previous prime is 2855513. The next prime is 2855557. The reversal of 2855521 is 1255582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1255582 = 2 ⋅627791.

It can be written as a sum of positive squares in 2 ways, for example, as 1500625 + 1354896 = 1225^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2855521 - 2³ = 2855513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2855521.

It is not an unprimeable number, because it can be changed into a prime (2855581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3160 + ... + 3961.

It is an arithmetic number, because the mean of its divisors is an integer number (715761).

2^2855521 is an apocalyptic number.

It is an amenable number.

2855521 is a deficient number, since it is larger than the sum of its proper divisors (7523).

2855521 is an equidigital number, since it uses as much as digits as its factorization.

2855521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7522.

The product of its digits is 4000, while the sum is 28.

The square root of 2855521 is about 1689.8286895422. The cubic root of 2855521 is about 141.8714865839.

The spelling of 2855521 in words is "two million, eight hundred fifty-five thousand, five hundred twenty-one".